DIY ASR Defeat Switch - PeachParts Mercedes-Benz Forum

aldedmon · #1 01-27-2003, 10:53 AM

vcci wrote

Quote:

Just to let you all know I had a friend look at the diagram of the ASR defeat in one of the posts here and in 20 minutes he was able to turn it off. Monday I will buy him a switch from a w140 and he will be able o install, now I dont know why RENNtech charges almost $1000 for something so simple. The car now is like a completely different car, the thing is a sick monster and I love it 100 more than I did before the ASR was turned off. If anyone needs to know how this was done I will be happy to help.

I thought it would be great to start a unique thread on this topic so that any/all who are interested could easily find the info.

vcci, the floor is yours

Tump · #2 01-27-2003, 01:15 PM

Dear vcci & aldedmon:

By all means please post or email to me instructions on how to build an ASR defeat switch.

I want to rid my car of ASR and have a limited-slip differential installed. So far, Renntech estimated that this mod. would cost me $3K at their shop, but if I defeat the ASR first, their price should come down to $2K.

Thanks for all your help.

jvmaxime · #3 11-09-2007, 09:37 PM

Hi everybody.
I just got a used 1997 s420. The other day I was backing in to my driveway and one of my back wheel was on the grass. Since it was raining when I pressed on the gas pedal the wheel slips and the next day I went to start it, I had an ASR light that came on. The car had no power and it took a while before it went away. I figured it went away for good but it keeps on coming back. It does not have a pattern. I tried using a dtc code reader it comes up with throttle valve actuator, EVAP. Can anyone help me fix this? Also, the car has an off switch for the asr but it has no effect at all when I pressed the off switch.
best regards.
jv

#4 01-28-2003, 01:45 PM

The limited slip diff is expensive if you have ASR because there are components inside the diff that support the ASR. If you "defeat" the ASR it will still be expensive to install the limited slip because ASR is still there, it's just not operating. You could fit a non ASR diff I suppose.

Matt.

vcci · #5 01-30-2003, 01:22 AM

Ok this is the deal. I am not too familiar with the electronics of cars but I will do my best to tell you everything I know.
After searching this site for about 2 weeks trying to figure out why it costs almost $1000 to get this damn ASR off in my car I ran into a post that showed a diagram of the ASR defeat system and the way it works. I also found complete instructions for installing the ASR defeat made by RENNtech and had a friend of mine take a look at it. After just a minute of looking at it my friend says "this is a piece of cake, how much did you say this costs?" 20 minutes later he tells me to take it for a spin and see if the wheels are spinning, and guess what, those tires were burning like no other benz ever burned. What you need to do first is find the installation instruction posted somewhere on this site, I cant find them again for some reason. Now, find the box located near the firewall on the driver's side being help by 4 allen screws, remove the the complete box, find the computer named ASR and remember what slot in went in to. If you look at the instructions it will give you colors of the wires and numbers, all my friend did was disconnect those 3 wires. This will completely turn off the ASR the car will burn rubber like you wont believe. Please excuse my limited knowledge of the process. My friend now made for my car a box with 3 modules or relays ( i dont remember which ones he said but I will ask him and post again) located inside, he will connect a switch to the box with modules or relays and I will be able to tur the ASR system on and off. I was gonna buy an original W140 ASR switch and put it on the panel next to the snow chain switch but I figured having it mounted under the steering column would give me an advantage of having it off when I give to my wife to drive and not having her mess around with too much power for her to handle. I have been driving the car for about 5 days now and can tell you that this has completely changed my views of te 500E, it is simply a 4 door porsche, amazing performance, a sedan like no other etc. I have read posts regarding the ASR defeat is kinda like keeping the snow tire chain system engaged for higher speeds, NOT TRUE, the wheels are still being kept from spinning. The ASR light has been on since this was done but I'm sure it will turn off after my on/off switch is switched to off. Let me know if you have any further question and I will try to answer them the best I can or I will ask my friend and get the right answers for you. ANYWAY SORRY FOR THE LONG POST BUT IT SURE BEATS PAYING ALMOST $1000 FOR SOMETHING SO SIMPLE.

jcyhome · #6 06-25-2005, 04:25 AM

Quote:

Originally Posted by vcci

Ok this is the deal. I am not too familiar with the electronics of cars but I will do my best to tell you everything I know.
After searching this site for about 2 weeks trying to figure out why it costs almost $1000 to get this damn ASR off in my car I ran into a post that showed a diagram of the ASR defeat system and the way it works. I also found complete instructions for installing the ASR defeat made by RENNtech and had a friend of mine take a look at it. After just a minute of looking at it my friend says "this is a piece of cake, how much did you say this costs?" 20 minutes later he tells me to take it for a spin and see if the wheels are spinning, and guess what, those tires were burning like no other benz ever burned. What you need to do first is find the installation instruction posted somewhere on this site, I cant find them again for some reason. Now, find the box located near the firewall on the driver's side being help by 4 allen screws, remove the the complete box, find the computer named ASR and remember what slot in went in to. If you look at the instructions it will give you colors of the wires and numbers, all my friend did was disconnect those 3 wires. This will completely turn off the ASR the car will burn rubber like you wont believe. Please excuse my limited knowledge of the process. My friend now made for my car a box with 3 modules or relays ( i dont remember which ones he said but I will ask him and post again) located inside, he will connect a switch to the box with modules or relays and I will be able to tur the ASR system on and off. I was gonna buy an original W140 ASR switch and put it on the panel next to the snow chain switch but I figured having it mounted under the steering column would give me an advantage of having it off when I give to my wife to drive and not having her mess around with too much power for her to handle. I have been driving the car for about 5 days now and can tell you that this has completely changed my views of te 500E, it is simply a 4 door porsche, amazing performance, a sedan like no other etc. I have read posts regarding the ASR defeat is kinda like keeping the snow tire chain system engaged for higher speeds, NOT TRUE, the wheels are still being kept from spinning. The ASR light has been on since this was done but I'm sure it will turn off after my on/off switch is switched to off. Let me know if you have any further question and I will try to answer them the best I can or I will ask my friend and get the right answers for you. ANYWAY SORRY FOR THE LONG POST BUT IT SURE BEATS PAYING ALMOST $1000 FOR SOMETHING SO SIMPLE.

Hi,i had a 1994 S600 and had a problem with ASR also,want to know if how can i switch it off permanently.had to switch off ignition switch everytime it malfunctions and limit the engine to 2000rpm only,after switching off the ignition,it restores it's power again.Thanks in advance

schabotte · #7 07-07-2005, 02:20 PM

I have a 1993 500SL with the asr going on and putting the car in limp mode when it is really hot outside and the AC is on full blast.

I'm in South Florida (West Palm Beach area.) Anyone know of a place down here with the knowledge to disable the ASR. I'm very mechanically uninclined.

Thanks,
Steven

leogetz97 · #8 08-04-2005, 09:17 AM

I've some problems finding that ASR unit. As pointed out in the Pics of the RENNTech kit there should the ASR named on it. However, I cant see that.

I've made a picture of the computers under that black cover. Maybe anyone can point me to the right computer?

My car is a 1991 500SL. Thanx!

@ michael: Do you still selling those kits? Are you willing to send them outside the US ?

Regards,

Leo

more pics:
http://217.77.141.254:99/DCP_2013.JPG
http://217.77.141.254:99/DCP_2016.JPG
http://217.77.141.254:99/DCP_2017.JPG

Michael · #9 08-15-2005, 06:44 PM

Leo,

I actually still have the parts for a few more kits kicking around. If you'd like one, email me and we'll figure out how to get you one

placo1 · #10 01-30-2003, 01:43 AM

vcci,

Does diconnecting these wires affect the ABS System?

vcci · #11 01-30-2003, 02:13 AM

NOT AT ALL

Michael · #12 01-30-2003, 09:12 AM

vcci:

The ABS and ASR work off the same speed sensors, so my understanding is that if one's offline, then so is the other. Have you actually invoked ABS with a panic stop or two? Please let us know

Also, I was not able to locate any box on the driver's side as you mentioned - can you post a picture or more detailed instructions on how to find it? Thanks in advance

vcci · #13 01-30-2003, 10:49 AM

I have not envoked the ABS system but I will later today and post results, although I am pretty sure the ABS is functioning properly. The box I was refering to is on the passengers side next to the firewall.

aldedmon · #14 01-30-2003, 10:58 AM

RennTech Diagram
ASR defeat

vcci · #15 01-30-2003, 12:16 PM

Thank you Aldedmon for posting the instructions. As you all can see this will walk you through the steps of how to defeat your ASR.
NOTE: While looking for the wires at the connection of the ASR computer control unit we noticed that the colors were not as stated in the instructions, my friend went by the wire numbers and they were correct.
So far I have not had the switch installed in the car but if you just want ASR off this will do it. I will keep you informed after the switch has been installed.